﻿ The following equation represents a fusion reaction :Calculate t

## Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

## Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.

# 41.The following equation represents a fusion reaction :Calculate the value of Q.

Mass defect Δ m = Mass of reactant - Mass of product

677 Views

42. What is a Zener diode? Explain how it can be used to stabilise the voltage in a circuit.
381 Views

43. The output of an OR gate is connected to the input of a NOT gate. Draw the logic circuit of this combination and write its truth table.
203 Views

44.

The current flowing through a conductor is given by I = neAvd

(i) Identify each term in the equation.

(ii) Obtain an expression for vd, if the current flowing through the conductor of length I has its ends maintained at a potential difference of V volts.

1460 Views

45.

(i) Write an expression for Biot-Savart’s law in the vector form. Write an expression for the magnetic field at the centre of a circular coil of radius R, with N turns and carrying a current I.

(ii) A helium nucleus completes one round of a circle of radius 0.8 m in 2 seconds. Find the magnetic field at the centre of the circle.

278 Views

46. Show that  where Irms is the root mean square value of alternating current and I0 is its peak value.
359 Views

47.

(i) Derive an expression for the fringe width ‘y’ in Young’s double slit experiment. Use X as the wavelength of the monochromatic source, D as the distance of the screen from the slits and d as the distance of separation between the slits.

(ii) How does the fringe pattern change if the monochromatic source of light in the above experiment is replaced by a white source of light ?

4741 Views